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United States Patent | 5,349,697 |
Pelkonen | September 20, 1994 |
The program code of an object program of a radiotelephone is recorded into a RAM (3) rather than in an EPROM as is conventional. The checking of the program code and the loading of the program from an external device coupled thereto via an external bus is controlled by program recorded in a ROM (4). This allows the program code to be changed and updated as required with time consuming and expensive replacement of a whole memory.
Inventors: | Pelkonen; Sakari (Oulu, FI) |
Assignee: | Nokia Mobile Phones Ltd. (Salo, FI) |
Appl. No.: | 897280 |
Filed: | June 11, 1992 |
Jun 14, 1991[FI] | 912875 |
Current U.S. Class: | 455/572; 455/127.1; 714/722 |
Intern'l Class: | H04B 001/38 |
Field of Search: | 455/89,127,186.1,186.2,343 379/58 365/229 371/21.5,12 395/325,575 |
3882400 | May., 1975 | Hamada | 455/186. |
3980935 | Sep., 1976 | Worst | 365/229. |
4119915 | Oct., 1978 | Maddaloni | 455/186. |
4525865 | Jun., 1985 | Mears | 455/186. |
4593155 | Jun., 1986 | Hawkins | 455/89. |
4606076 | Aug., 1986 | Davis | 455/343. |
4646307 | Feb., 1987 | Nishimura | 371/21. |
4698808 | Oct., 1987 | Ishii | 371/21. |
4710971 | Dec., 1987 | Nozaki et al. | 455/179. |
4771399 | Sep., 1988 | Snowden et al. | 364/900. |
5086509 | Feb., 1992 | Inubushi et al. | 455/89. |
Foreign Patent Documents | |||
0003200 | Jan., 1983 | JP | 371/21. |
Finnish Office Action dated Feb. 21, 1992. |